Optical system



March 26, 1929. G. LOECK 4 1,706,930

OPTI CAL SYSTEM Filed Aug. 8, 1928 Q ZLXZMLA Patented Mar. 26, 1929.

UNITED. STATES PATENT OFFICE.

etimm LOECK, OI BERLIN, GEBKANY, ASBIGNOB TO THE FIB]! GEORG W01 G.

B. 3., 01' 3mm, GERMANY.

OPTICAL SYSTEM.

Application filed August 8, 1928, Serial No. 398,297, and in Germany September}, 1827.

The present invention relates to a new optical system for installation in urethroscopes, cystoscopes and in apparatus available for examination of the interior of narc row tubes-etc, in which the reversing systerns heretofore necessary between ob ective and eyepiece are dispensed with, thus resnlting 111 a simple system which however is fully suflicient in many cases.

The new system, according to the invention, consists of a short-focus objective sys tcin followed b a field lens, and ata roster distance in bac of it by a Galilean te esoope serving as an ocular which latter is arran in such a way as to have its positive mem r face the objective system. This system of lenses if used in conjunction with the ordinary roof prism in front of the objective; as usually employed in cystoscopes and in so similar instruments, produces upright and.

laterally correct images.

The annexed drawing shows a constructional example of a system according to the present invention as in conjunction with a on roof prism. The system as drawn consists of .an objective a followed by a field lens b, and by a Galilean telescope-serving as an ocular-consisting of lenses 0 and d. In frontof the objective a roof prism e is located.

ill

As may be seen, the installation of such systom into a mounting tube would be comparatively simple.

I claim:

1. Optical system available for the observation of articles through a comparative- 1] Ion and narrow tube consistmg of a s ortocus objective system, in back of which is arran ed a field lens, and a Galilean telescope, t e latter-consistingof a positive member and of a negative memberthe positive member facin the said objective s stem--, and the alilean telescope be ng coated at a large distance in the rear of the said field lens.

' 2. Optical system available for the observation of articles through a comparatively long and narrow tube consisting of a shortfocus ob'ective system, in back of which is arrang a field lens, and a Galilean tele scope, the latter consisting of a positive member and of a negatlve member-the positive member facm the said objective system-and the .Gali can telescope being located in the rear of the said field lens at a distance which is several times as large as 5 the distance between the field lens from the GUNTHER LOECK.

objective system. 

